Of all the components used in this assembly the Head Assy,cylinder Rr is the most expensive.
In this schematic the "Bolt" is used most often.
The most reasonably priced component used on the Vl800t Boulevard C50 2011 (l1) Usa Californi Canad (e03 E33 E28) Rear Cylinder Head (vl800 E28) is the Bolt(6x50).